TY  - JOUR
A1  - Schonlau, M.
A1  - Soest, A.
A1  - Kapteyn, A.
A1  - Couper, M.P.
T1  - Selection bias in web surveys and the use of propensity scores
Y1  - 2009
DO  - 10.1177/0049124108327128
VL  - 27
IS  - 3

ER  -